build: add Docker and Compose setup

.dockerignore

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+.gradle
+build

Dockerfile

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+FROM eclipse-temurin:21-jdk AS build
+
+WORKDIR /app
+
+COPY gradlew ./
+COPY gradle gradle
+COPY build.gradle settings.gradle ./
+COPY src src
+
+RUN chmod +x gradlew \
+    && ./gradlew bootJar -x test --no-daemon
+
+FROM eclipse-temurin:21-jre
+
+WORKDIR /app
+
+COPY --from=build /app/build/libs/reservation-demo-*.jar app.jar
+
+EXPOSE 8080
+
+ENTRYPOINT ["java", "-jar", "app.jar"]

compose.yml

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+name: reservation-demo
+
+services:
+  mysql:
+    image: mysql:8.4
+    container_name: reservation-demo-mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: reservation_demo
+      MYSQL_USER: demo
+      MYSQL_PASSWORD: demo
+    volumes:
+      - reservation-demo-mysql-data:/var/lib/mysql
+    command:
+      - --character-set-server=utf8mb4
+      - --collation-server=utf8mb4_unicode_ci
+
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: reservation-demo-app
+    ports:
+      - "8080:8080"
+    depends_on:
+      - mysql
+
+volumes:
+  reservation-demo-mysql-data: